Int 21 Fn 4409  - DOS 3.1+ - Ioctl - Check If Block Device Remote          [D]

   AX = 4409h
   BL = drive number (00h = default, 01h = A:, etc)

Return: CF clear if successful
       DX = device attribute word
       bit 15: drive is SUBSTituted
       bit 12: drive is remote
       bit  9: direct I/O not allowed
   CF set on error
       AX = error code (01h,0Fh) (see AH=59h)

Note:  on local drives, DX bits not listed above are the attribute word from
     the device driver header (see AH=52h); for remote drives, the other
     bits appear to be undefined for DOS versions prior to 5.0 (they are
     all cleared in DOS 5+)

See Also: AX=4400h,AX=4408h,AX=440Ah,INT 2F/AX=122Bh